| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.hyracks.dataflow.std.buffermanager; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| import org.apache.hyracks.api.comm.IFrameTupleAccessor; |
| import org.apache.hyracks.api.dataflow.value.RecordDescriptor; |
| import org.apache.hyracks.api.exceptions.HyracksDataException; |
| import org.apache.hyracks.dataflow.std.sort.util.DeletableFrameTupleAppender; |
| import org.apache.hyracks.dataflow.std.sort.util.IAppendDeletableFrameTupleAccessor; |
| import org.apache.hyracks.dataflow.std.structures.TuplePointer; |
| |
| /** |
| * Enable the delete record operation in the memory management. This is only used in the {@link org.apache.hyracks.dataflow.std.sort.HeapSortRunGenerator} |
| */ |
| public class VariableDeletableTupleMemoryManager implements IDeletableTupleBufferManager { |
| |
| private static final Logger LOG = Logger.getLogger(VariableDeletableTupleMemoryManager.class.getName()); |
| |
| private final int minFreeSpace; |
| private final IFramePool pool; |
| private final IFrameFreeSlotPolicy policy; |
| private final IAppendDeletableFrameTupleAccessor accessor; |
| private final ArrayList<ByteBuffer> frames; |
| private final RecordDescriptor recordDescriptor; |
| private int numTuples; |
| private int statsReOrg; |
| |
| public VariableDeletableTupleMemoryManager(IFramePool framePool, RecordDescriptor recordDescriptor) { |
| this.pool = framePool; |
| int maxFrames = framePool.getMemoryBudgetBytes() / framePool.getMinFrameSize(); |
| this.policy = new FrameFreeSlotLastFit(maxFrames); |
| this.accessor = new DeletableFrameTupleAppender(recordDescriptor); |
| this.frames = new ArrayList<>(); |
| this.minFreeSpace = calculateMinFreeSpace(recordDescriptor); |
| this.recordDescriptor = recordDescriptor; |
| this.numTuples = 0; |
| this.statsReOrg = 0; |
| } |
| |
| @Override |
| public void reset() throws HyracksDataException { |
| pool.reset(); |
| policy.reset(); |
| frames.clear(); |
| numTuples = 0; |
| } |
| |
| @Override |
| public int getNumTuples() { |
| return numTuples; |
| } |
| |
| @Override |
| public boolean insertTuple(IFrameTupleAccessor fta, int idx, TuplePointer tuplePointer) |
| throws HyracksDataException { |
| int requiredFreeSpace = calculatePhysicalSpace(fta, idx); |
| int frameId = findAvailableFrame(requiredFreeSpace); |
| if (frameId < 0) { |
| if (canBeInsertedAfterCleanUpFragmentation(requiredFreeSpace)) { |
| reOrganizeFrames(); |
| frameId = findAvailableFrame(requiredFreeSpace); |
| statsReOrg++; |
| } else { |
| return false; |
| } |
| } |
| assert frameId >= 0; |
| accessor.reset(frames.get(frameId)); |
| assert accessor.getContiguousFreeSpace() >= requiredFreeSpace; |
| int tid = accessor.append(fta, idx); |
| assert tid >= 0; |
| tuplePointer.reset(frameId, tid); |
| if (accessor.getContiguousFreeSpace() > minFreeSpace) { |
| policy.pushNewFrame(frameId, accessor.getContiguousFreeSpace()); |
| } |
| numTuples++; |
| return true; |
| } |
| |
| private void reOrganizeFrames() { |
| policy.reset(); |
| for (int i = 0; i < frames.size(); i++) { |
| accessor.reset(frames.get(i)); |
| accessor.reOrganizeBuffer(); |
| policy.pushNewFrame(i, accessor.getContiguousFreeSpace()); |
| } |
| } |
| |
| private boolean canBeInsertedAfterCleanUpFragmentation(int requiredFreeSpace) { |
| for (int i = 0; i < frames.size(); i++) { |
| accessor.reset(frames.get(i)); |
| if (accessor.getTotalFreeSpace() >= requiredFreeSpace) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private int findAvailableFrame(int requiredFreeSpace) throws HyracksDataException { |
| int frameId = policy.popBestFit(requiredFreeSpace); |
| if (frameId >= 0) { |
| return frameId; |
| } |
| |
| int frameSize = calculateMinFrameSizeToPlaceTuple(requiredFreeSpace, pool.getMinFrameSize()); |
| ByteBuffer buffer = pool.allocateFrame(frameSize); |
| if (buffer != null) { |
| accessor.clear(buffer); |
| frames.add(buffer); |
| return frames.size() - 1; |
| } |
| return -1; |
| } |
| |
| private static int calculateMinFrameSizeToPlaceTuple(int requiredFreeSpace, int minFrameSize) { |
| return (1 + (requiredFreeSpace + 4 - 1) / minFrameSize) * minFrameSize; |
| } |
| |
| private static int calculatePhysicalSpace(IFrameTupleAccessor fta, int idx) { |
| // 4 bytes to store the offset |
| return 4 + fta.getTupleLength(idx); |
| } |
| |
| private static int calculateMinFreeSpace(RecordDescriptor recordDescriptor) { |
| // + 4 for the tuple offset |
| return recordDescriptor.getFieldCount() * 4 + 4; |
| } |
| |
| @Override |
| public void deleteTuple(TuplePointer tuplePointer) throws HyracksDataException { |
| accessor.reset(frames.get(tuplePointer.getFrameIndex())); |
| accessor.delete(tuplePointer.getTupleIndex()); |
| numTuples--; |
| } |
| |
| @Override |
| public void close() { |
| pool.close(); |
| policy.reset(); |
| frames.clear(); |
| numTuples = 0; |
| if (LOG.isLoggable(Level.FINE)) { |
| LOG.fine("VariableTupleMemoryManager has reorganized " + statsReOrg + " times"); |
| } |
| statsReOrg = 0; |
| } |
| |
| @Override |
| public ITuplePointerAccessor createTuplePointerAccessor() { |
| return new AbstractTuplePointerAccessor() { |
| private IAppendDeletableFrameTupleAccessor bufferAccessor = new DeletableFrameTupleAppender( |
| recordDescriptor); |
| |
| @Override |
| IFrameTupleAccessor getInnerAccessor() { |
| return bufferAccessor; |
| } |
| |
| @Override |
| void resetInnerAccessor(TuplePointer tuplePointer) { |
| bufferAccessor.reset(frames.get(tuplePointer.getFrameIndex())); |
| } |
| }; |
| } |
| |
| } |